Fresh crank rebuild problem

[VintageKiwi]

Hi everyone.

I have recently put a new crank in my GT750., new seals bearings etc.
Well the left and centre cylinders run well, except the right side which smokes really badly then cuts out, there are masses of oil all around the exhaust where it bolts up to the cylinder, I removed the bottom right hand side SRIS valve and to my shock engine oil came dripping out so
Is the crank incorrectly installed or has a crank seal let go , just wondering or if you have any ideas before i take it apart again
thanks,
Jim

[GT750Battleship]

Hi,before expecting the worst..this could be nothing more than the oil pump set to high? how much oil did you put in the gear box ? Who did the crank? the crank seals need to be inspected to make sure their not rubbing on anything before closing the crankcases!
If the motor has been apart you'd expect it to take a little more than the 2,200ml/cc that figure refers to a normal gear box oil change,not a bone dry transmission.The right hand crank bearing is splash fed with gear box oil..that's why I'm asking about oil quantity ? The oil coming out of the right hand exhaust port may be nothing more than a leaking exhaust gasket ? I suggest you leave the SRIS valve out on that cylinder,remove all spark plugs,disconnect fuel supply,& pump her "dry" with the electric start,then have another try

Cheers,
Roger

[tz375]

Most likely a leaky oil feed line that we often refer to as the octopus even though it only has 6 legs. The check valves tend to leak over time and allow the crankcases to fill with oil.

[Coyote]

I think the correct word for the octopus thingy is manifold.

[ConnerVT]

I think the correct word for the octopus thingy is manifold.

Sextapus?

[titan performance]

I went out with one of those once.........happy days !

[GT750Battleship]

I'll stick with Octopus,seems to be the term used by the lads in the UK ? PS I have a "NOS" Octopus.never been on a bike!!! (GT750)
Cheers,
Roger

[Vintageman]

I removed the bottom right hand side SRIS valve and to my shock engine oil came dripping out

could you tell if it was gear oil or two stroke oil. I mean are the two in your bike a different color and smell?

[VintageKiwi]

Sure was gearbox oil dripping out of the SRIS valve, I am wondering if the gearbox was over filled and the bike then lent over
(to repair the gear position switch) then is it possible that gearbox oil can seep into the RH side crank.
I have done what was suggested by GT Battleship and cranked it dry, when i started it again there was less smoke and oil spurting, so will crank it up again to today and check again.

thanks everyone for your help.
Jim

[Vintageman]

When you rev it up driving down the road does gear oil come out the crankcase vent weep hole by oil Pump?

I think the far right seal is dry. So not there

The inner one blocks gear oil since PTO for clutch other side of it.

Cases halves must be tight fit I suppose too, but not sure why it would not be,

Try again. look at crankcase vent for blowing out gear oil when after hard run.

What year is your gt750?